But which move is "insane"?

I'm thinking the same thing. 24. Ne6 seems such a strong move that we might be able to play it on general principles without having to go through the full "he goes here, I go there" tree of analysis thing.

The main thing to spot, I think, is that it is safe to plonk the knight on a square which is attacked twice but only defended once. Black gets into a lot of trouble if he indulges in an orgy of piece taking: 24. Ne6 Bxe6 25. dxe6 Nxe6?

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Now white can play 26. Bh3 and black is suffering. The pinned Ne6 can't be adequately defended, black has weak pawns everywhere and Qa8+ is going to hurt. A lot.

That's what I spotted in human mode, but Fritzie finds that the immediate 26. Qa8+ is even more painful for black. Then we might get this fun continuation: 26. Qa8+ Qb8 27. Qc6+ Qc7 28. Qe8+!

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The white queen and passed pawn effectively paralyse both the kingside and queenside.

So if Ne6 is playable tactically we've got to want it on positional grounds - we either get a nicely outposted knight or black has to give us connected passed pawns on the sixth and seventh, which surely has to be sufficient compensation for starting the position a piece down.

Incidentally #1, Fritzie also likes 24. Re1 and 24. Qf4 with the idea of playing a later Ne6.

<30. Bb5>

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30... Qxe8

(30... Rf8 31. Rd4 Ka7 32.
Rxb4 d5 33. a3 Qd6 34. Bc6 ;

30... Ne4 31. Ba4 Ka7 32. Qb5 Nc5 33. Qxb4 Qb6 34. Bb5 Nxe6 35. Re1 Rf8 36. a4 Rxf7 37. Rxe6 )

31. fxe8=Q+ (not 31. Bxe8?? Kc7 =)31...Rxe8 32. Bxe8 h4 33. Rd4 .

24.Qf6 is a "try" but I'm not seeing it. 24...Rh6 25.Qg5 Qd8 26.Qg8 Be7.

24.Qg3 Be7 25.Qg8+ Qd8 26.Bxa6+ Nxa6 27.Rg1 is very doubtful.

24.Bxa6+ Nxa6 25.Rg1 Bg4 26.Qg2 - again I have doubts.

I would go with 24.Qf6.

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I am with you on 24 .. Qb6 or Qb7...

I think the worst thing would be to capture the Knight on e6 and allow two connected passed pawns.

However most likely white would then play 25 Qf6 which will cause problems for black.

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Black threatens 24... Bg4.

An interesting idea is to remove de d-pawn from the a8-h1 diagonal to attack the black king with 24.Ne6:

A) 24... Nxe6 25.dxe6

A.1) 25... Bxe6 26.Qa8+ Qb8 (26... Kd7 27.Qe8#) 27.Qc6+ Qc7 (or 27... Kd8 28.Qe8+) 28.Qe8+ (28.Bxa6+ Kb7 29.Qe8+ Ka7 30.Qxe6 Kxa6) 28... Kb7 (28... Qd8 29.Bxa6+) 29.Qxe6 and White has an extra pawn and the better position.

A.2) 25... Bc6 26.Bxa6+ and White has three pawns for the bishop, two advanced passed pawns and the iniciative.

A.3) 25... Bb5 26.Bxb5 axb5 27.Qa8+ Qb8 28.Qxb8+ (another option is 28.Qc6+ Qc7 (28... Kd8 29.Qd7#) 29.Qxb5 with several threats, Qxb4, Rd4-c4, etc.) 28... Kxb8 29.Rg1 looks good for White. For example, 29... Rh6 30.Rg8 Rxe6 31.Rxf8+ Kc7 32.Rc8+ Kd7 33.b3 + -.

B) 24... Bxe6 25.dxe6

B.1) 25... Nxe6 26.Bh3 Rh6 27.Qa8+ Qb8 (27... Kd7 28.Qe8#) 28.Qc6+ followed by Qe8+ is similar to A.1.

B.2) 25... Kb8 26.Bg2

B.2.a) 26... Qb7 27.Qf6 Qxg2 (27... Rh6 28.Qxh6 Bxh6 29.Bxb7+ Kxb7 30.e7 + -) 28.Qxh8 Nxe6 29.Qxh5 + - [R+2P vs B+N].

B.2.b) 26... Nb7 27.Rd4 d5 28.Qxd5 looks good for White.

Over the board I'd try the relatively slow

24 Qf6 Rh6
25 Qg5 Qd8
26 Qg8

with a plan of Re1/Re8, mixing in a Bh3 to pressure the d7 bishop.